High-Voltage Arc Emission Control for Cold-Start Exhaust
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Solution Overview
Problem
Existing exhaust systems for vehicles require a warm-up period for catalytic converters to effectively reduce toxic gas emissions, allowing harmful gases to be released during startup.
Innovation Solution
An apparatus with a shell and electrode in the exhaust path that uses high-voltage pulses to create an arc, breaking down toxic gases with a substrate coated oxidizer and additional plasma treatment to reduce emissions quickly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a catalytic converter is used to reduce toxic gas emissions, then toxic gases are reduced, but the system requires a warm-up period during which toxic gases are expelled
Solution Approach 1:
The emission control system is divided into two distinct segments: a pre-catalytic converter for immediate toxin reduction during startup, and a main catalytic converter for sustained emission control. This segmentation allows each component to specialize - the pre-catalytic converter handles the warm-up phase while the main converter takes over once operational temperature is reached, eliminating the harmful emissions during the warm-up period that would otherwise occur.
Solution Approach 2:
The pre-catalytic converter is positioned upstream and activated first to perform preliminary emission control during the critical startup phase before the main catalytic converter becomes operational. This preliminary action ensures that toxic gases are reduced from the beginning of engine operation, rather than waiting for the main converter to warm up.
2Object-affected harmful factors
If a pre-catalytic converter is added to reduce toxins during startup, then toxic gas reduction during warm-up is improved, but device complexity increases
Solution Approach 1:
The pre-catalytic converter and main catalytic converter are merged into a single integrated exhaust system with a unified housing and coordinated operation. The pre-catalytic converter is positioned within the same exhaust stream path as the main converter, and both are controlled by a coordinated system that manages their activation and operation as a combined unit, reducing overall system complexity compared to separate independent systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces THC, carbon monoxide, and nitrogen oxides while increasing oxygen levels, functioning immediately upon activation without a warm-up period.
Implementation Method 1
the control system pulses a voltage at a rate and voltage dependent on a firing rate of the engine of the vehicle. When the electrode pulses, a current arcs from the electrode to the screens to process the exhaust gases
Implementation Method 2
the electrode also produces an arc to the second screen, which creates plasma to remove more toxins
Implementation Method 3
A substrate coated with an oxidizer is disposed within the shell downstream from the first screen
Data Source
AI summary
An apparatus for reducing toxic gases from exhaust of a vehicle comprises a shell disposed in line with an exhaust path of a vehicle and an electrode that passes through the shell. Further, the apparatus comprises a power control system programmed to supply at least 120 kV to the electrode at a predefined pulse rate, which creates an arc of electricity forms between the electrode and a first screen. A substrate coated with an oxidizer is disposed within the shell downstream from the first screen. Further, a second screen is disposed within the shell downstream from the substrate such that the substrate is disposed between the first screen and the second screen.